Fast Large-Scale Electromagnetic Field Analysis Using PC Cluster for Optimal Design of Electric Machines

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Precise analysis of complex phenomena and detailed design optimization of electric and electronic devices require a large-scale electromagnetic field analysis, which costs a large amount of computation time. However, the recent development of high performance computing techniques including parallel computation has not yet been applied sufficiently to the large-scale electromagnetic field analysis.The purpose of this research is to achieve the fast and precise large-scale electromagnetic field analysis for optimal design of electric machines under parallel computing environment. For this purpose this research aims to develop (1) efficient algorithms for fast electromagnetic field analyses, and (2) advanced optimal design methods for electric machines including accurate iron-loss evaluation.The obtained results are categorized into the four elements below.(1-a)Algebraic Multigrid (AMG) Algorithm for Electromagnetic Field AnalysesAn AMG solver for linear systems of equations involving real symmetric H-matrices is developed. A new AMG technique for electromagnetic finite edge-element analysis is proposed.(1-b).Parallel Solvers for Linear Systems of EquationsA new parallel ordering, "block red-black ordering," is proposed for a parallelized ICCG solver with fewer synchronization points and a high convergence rate.(2-a)Parallel Genetic Algorithm (GA) for Optimal Design of Electric MachinesThe island parallel GA efficiently achieves an optimum design of electric machinery on a distributed parallel computing system.(2-b)Magnetic Property Modeling and Nonconforming Mesh FEM for Advanced Electromagnetic Field AnalysisEfficient arid accurate DC hysteresis models for electrical steel sheets are developed, which are based on the stop and/or play models. The DC hysteresis models are used for eddy-current analyses to represent AC B-H loops accurately. The mortar finite element method is studied, which is applied to a magnetic-field analysis of rotating machinery.